green politics, sure, all on board. but the parties - no way. too unserious, too unrealistic, too anti-science, too cranky and too nimby.
also always too moral highgroundy - see Caroline Lucas saying 'don't do that' about building new nuclear power, but then when it's delayed saying 'it's taking too long' pretending she was on board with it in the first place. they're more at home with opposing things and blocking them than they are at constructively improving and enabling things.
NIMBYism is something that affects local politics of all parties unfortunately, but it's very much more a core part of the DNA that runs through the Lib Dems and Greens - they take so much pride in preventing infrastructure and housing projects, lying that there are more perfect ways to get things built when all they're doing is finding any old avenue to delay and prevent things.
it's not unique to UK either. just look at the insane ignorance of the german greens who (unlike their UK counterparts) contributed to 'achieving' some policy changes - only sadly their achievement was convincing enough people - through misinformation and misinterpretation and anti-science bollocks - to turn their backs on nuclear power. so now germany is more reliant on fossil fuels thanks for the most part to their green party. great work, team.
also the party is too filled with bigoted cranks for me. it's often become a resting home for those people on the fringes right and left (predominantly left) who can't get on board with a labour party seeking to win power when what they want is a labour. you just need to see some of the high profile cranks and bigots who've been welcomed with open arms into the green party after being expelled from labour